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Concept explainers
Following gastrulation, the cells that have folded inward develop into
a. | endoderm. |
b. | ectoderm. |
c. | mesoderm. |
d. | All of these are correct. |
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Introduction:
Gastrulation is the process of embryonic development in which the blastula develops into gastrula. Gastrula is a cup shaped structure which consists of 3 tissue layers. The germ layer of gastrula gives rise to all of the body’s tissues and organs.
Answer to Problem 1MCQ
Correct answer:
Following gastrulation, the cells that have folded inward develop into endoderm. Hence, the correct answer is options a.
Explanation of Solution
Reason for correct answer:
Option a. is given as, “endoderm.”
The gastrula is made of three layers, in which the innermost is the endoderm that becomes the digestive tract and the internal organs. The cells folding inwards develop into endoderm layer of the gastrula. Hence, option a. is correct.
Hence, the option a. is correct
Reason for incorrect answers:
Option b. is given as, “ectoderm.”
Ectoderm is the outer tissue layer of the gastrula which develops into skin and nervous system. The cells that fold inwards do not form ectoderm. Hence, option b. is incorrect.
Option c. is given as, “mesoderm.”
Mesoderm is the tissue layer that forms between the ectoderm and endoderm. This layer gives rise to muscles, bones, circulatory system, and other specialized structures. It does not develop when the cells fold inward. Hence, option c. is incorrect.
Option d. is given as, “all of these are correct.”
The cells that fold inwards only develop into endoderm, not ectoderm or mesoderm. Hence, option d. is incorrect.
Hence, the options b., c., and d. are incorrect.
The cells that have folded inward develop into endoderm following gastrulation. Thus, the correct option is a.
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Chapter 17 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
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- What are the correct pairings of developing and embryonic structures in the gastrulation of chickens? a. Epiblast- ectoderm c. Primary hypoblast-endoderm Read the following statements CAREFULLY: I. II. III. IV. b. Secondary hypoblast - endoderm d. Migrating cells - mesoderm The germ band needs to retract for fruit fly segments to develop properly. The formation of the sea urchin archenteron is made possible by epithelial cells that underwent epithelial-to-mesenchymal transition. Frog gastrulation involves the epiboly of endoderm cells. Chicken endoderm and mesoderm is formed through the migration of cells through both the anterior and posterior end of the primitive streak. a. All choices are true b. I & Il are true but IV is false d. IV is sometimes true c. Ill is falsearrow_forwardThe cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently from the three germ layers.c. originate directly from the tissue that will develop into thegonads.d. are some of the last cells of the embryo to differentiate.e. are formed the same way in all animals.arrow_forwardResearchers searched for an activator of neural tissue formation. What is the real pathway for this developmental phenomenon? a. Neural tissue formation occurs via BMP inhibition by proteins secreted from the organizer. b. Noggin activates ectoderm to become neural tissue. c. Nodal activation induces mesoderm to make neural tissue. d. Beta-catenin is required for formation of neural tissue.arrow_forward
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